BIO - Chapter 3 Cell Function and function Cells are the...

Chapter 3: Cell Function and function Cells are the smallest entities that can perform all basic life functions. Each cell performs its own specialized functions to maintain homeostasis, and are the building blocks of our body. Cell theory-cells are the building blocks of all plants and animals-cells are the smallest functioning units of life-cells are produced through the division of preexisting cells-each cell maintains homeostasis. Cytology is the study of the structure and function of cells. Cell functions and Structure: See ECC Notes Chromosome Structure:-The nucleus hold DNA which stores instructions for protein synthesis and this DNA is contained in chromosomes-The nuclei of the human body cells contain 23 pairs of chromosomes. ( one from mother, one from father)-Each chromosome contains DNA strands wrapped around special proteins called histones. Tightness of DNA coiling determines whether the chromosome is long and thin or short and fat.-In cells that are not dividing, the DNA is loosely coiled forming a tangle of fine filaments known as chromatin. Genetic Code:

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